1
IIT-JEE 1996
Subjective
+3
-0
The ionisation constant of $$NH_4^+$$ in water is 5.6 $$\times$$ 10-10 at 25oC. The rate constant for the reaction of $$NH_4^+$$ and $$OH^-$$ to form NH3 and H2O at 25oC is 3.4 $$\times$$ 1010 L mol-1s-1. Calculate the rate constant for proton transfer from water to NH3.
2
IIT-JEE 1995
Subjective
+4
-0
At 380oC, the half-life period for the first order decomposition of H2O2 is 360 min. Calculate the time required for 75% decomposition at 450oC.
3
IIT-JEE 1993
Subjective
+4
-0
A first order reaction A $$\to$$ B, requires activation energy of 70 kJ mol-1. When 20% solution of A was kept at 25oC for 20 minutes, 25% decomposition tooks place. What will be the percentage decomposition in the same time in a 30% solution maintained at 40oC? Assume that activation energy remains constant in this range of temperature.
4
IIT-JEE 1991
Subjective
+6
-0
The decomposition of N2O5 according to the equation:
2N2O5 (g) $$\to$$ 4NO2(g) + O2(g)
is a first order reaction. After 30 min. from the start of the decomposition in a closed vessel, the total pressure developed is found to be 284.5 mm of Hg and on complete decomposition, the total pressure is 584.5 mm of Hg. Calculate the rate constant of the reaction.
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